ETF comparison
MDY vs VO
Both US Mid Cap.
State Street SPDR S&P MIDCAP 400 ETF Trust · Vanguard Morningstar Mid-Cap ETF
Holdings overlap
1 positions appear in both funds. Buying equal dollars of MDY and VO would leave roughly 0.1% of each dollar exposed to the same underlying securities.
Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for why.
Cost difference
VO is 20 bps cheaper than MDY. On a $100,000 position that's about $200/yr more in fees for MDY.
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with MDY vs VO.
Top shared holdings
1 shared in total| # | Holding | In MDY | In VO | Overlap |
|---|---|---|---|---|
| 1 | Burlington Stores Inc. | 0.50% | 0.10% | 0.10% |
Only in MDY
400 total- Twilio Inc. Class A 1.30%
- Okta Inc. Class A 1.01%
- U.S. Dollar 0.89%
- nVent Electric plc 0.79%
- TechnipFMC plc 0.77%
- ATI Inc 0.75%
- Entegris Inc. 0.73%
- United Therapeutics Corporation 0.67%
- MACOM Technology Solutions Holdings Inc. 0.64%
- TD SYNNEX Corporation 0.64%
Only in VO
281 total- Vertiv Holdings Co 1.22%
- Western Digital Corp 1.06%
- Seagate Technology Holdings PLC 1.05%
- Quanta Services Inc 1.04%
- Howmet Aerospace Inc 1.04%
- Cummins Inc 0.95%
- Datadog Inc 0.83%
- Bloom Energy Corp 0.79%
- Constellation Energy Corp 0.78%
- Robinhood Markets Inc 0.77%
Related comparisons
More comparisons with MDY
More comparisons with VO
- VO vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 0.1%
- VO vs DFSV · DFA U.S. Small Cap Value Portfolio – ETF Class Shares 0.1%
- VO vs DFAS · U.S. Small Cap Portfolio-ETF Class Shares 0.1%
- VO vs BBSC · JPMorgan BetaBuilders U.S. Small Cap Equity ETF 0.0%
- VO vs AVUV · Avantis US Small Cap Value ETF 0.0%
- VO vs DEM · WisdomTree Emerging Markets High Dividend Fund 0.0%
Percentages are holdings overlap with the named fund.
Open MDY or VO at a brokerage
Both funds trade commission-free at major US brokerages.
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.
Holdings overlap is the sum of min(weight_a, weight_b) over positions
matched on ISIN (CUSIP fallback). Methodology: see
/methodology/.
Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.